On Tue, 16 May 2023 18:46:29 -0700 Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > So don't even ask for other GUP functionality, much less the "remote" > kind. Not going to happen. If you think you need access to remote > process memory, you had better do it in process context, or you had > better just think again. So this code path is very much in user context (called directly by a write system call). The issue that Alexei had was that it's also in an rcu_read_lock() section. I wonder if this all goes away if we switch to SRCU? That is, sleepable RCU. -- Steve
